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More Compact Control Panel Circuit Protection

6/12/2026

It can be a complicated balancing act, making sure your control panel can handle increasing power densities and still maintain a small footprint. The FS Series Class J Fused Switch from Mersen is a protection solution that helps panel designers maximize every inch of space without sacrificing performance. Delivering UL 98-listed branch circuit protection with a 200kA short-circuit current rating (SCCR), this product takes up significantly less space than a standard fuse holder and traditional disconnect switch combination.

The FS Series Class J Fused Switch accepts all standard 30A and 60A Class J fuses for design flexibility and streamlined installations. Simple, effective safety features such as integrated lockout/tagout (LOTO) capabilities and LED fuse status indication provide an extra benefit to end-users. Save engineering and procurement time, create compact, higher-density panels, and maintain safe performance for your control panels with compact Class J fused switches from Mersen.

Features & Benefits

Savings

  • Requires less panel space than a traditional fuse holder and disconnect switch combination
  • Fewer components and less total cost than switches and fuse holders
  • Streamlines the specification process and installations

Performance

  • Accepts all Class J 30A and 60A fuses
  • Delivers a max interrupting rating of 200kA SCCR
  • 90V-AC and 12V-DC minimum indicator voltage
  • Suitable as a main/feeder device

Certified Safety

  • Provides branch circuit protection
  • Built-in lockout/tagout capability
  • Integrated LED fuse status indication
  • UL 98-listed and IP20-rated

Questions or requests

The FS Series fused disconnect switch from Mersen offers improved off-the-shelf availability. If you are looking for compact and convenient branch circuit protection, contact your McNaughton-McKay account manager or visit your local branch today.

Additional Resources